Effect of energy intake after weaning on the sexual development of beef bulls. II. Age at first mating, age at puberty, testosterone and scrotal circumference

Journal of Animal Science
R J PruittG H Kiracofe

Abstract

Simmental and Hereford bulls were individually fed varying levels of the same diet to determine the effect of energy intake after weaning on rate of sexual development. For 200 d, 29 Simmentals were fed an average of 14.6, 19.2 or 23.8 Mcal and 27 Herefords were fed 13.4, 17.5 or 22.2 Mcal metabolizable energy per bull daily. Higher energy did not hasten sexual development, as measured by serum testosterone, age at first mating or age at puberty. As energy level increased, weight at puberty increased (P less than .05) for both breeds, and scrotal circumference at puberty increased (P less than .05) for Simmentals. When adjusted for breed and energy level, bulls that were heavier at 1 yr of age had larger scrotal circumference (P less than .05) and were younger at puberty (P less than .01). Bulls that had higher serum testosterone at 1 yr of age reached puberty earlier (P less than .01). At a constant age there was no relationship between testosterone and scrotal circumference. Although higher levels of energy increased scrotal circumference of Simmentals, it did not hasten sexual development for either breed.

Citations

Jun 15, 2011·Acta Veterinaria Hungarica·Péter SarlósJózsef Rátky
Sep 10, 2015·Animal : an International Journal of Animal Bioscience·A B P FontouraS P Miller
May 19, 2005·Reproduction, Fertility, and Development·G M SchuenemannF N Schrick
Jul 25, 2008·Reproduction in Domestic Animals = Zuchthygiene·N RawlingsE T Bagu
Jan 1, 1990·Nutrition Research Reviews·J J Robinson
Mar 22, 2018·Animal : an International Journal of Animal Bioscience·A D Barth
May 27, 2006·Theriogenology·C Silva-Mena
Aug 20, 2019·Theriogenology·Silvio R O MenegassiJúlio O J Barcellos

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